JP7487855B2 - Gas Circuit Breaker - Google Patents

Description

The present disclosure relates to a gas circuit breaker equipped with a cooling tube that cools the insulating gas sprayed onto the arc.

Power systems are equipped with gas circuit breakers that open and close current circuits and interrupt short-circuit currents. Gas circuit breakers open the current circuit when excessive current flows through the power system due to lightning strikes or other events. At this time, an arc occurs at the open part of the current circuit, and a short-circuit current flows. In order to interrupt the short-circuit current caused by an arc, gas circuit breakers are configured to extinguish the arc by spraying high-temperature, high-velocity insulating gas, generated by the energy of the discharge itself, onto the arc.

The sprayed insulating gas is heated by the arc and reaches a high temperature. If the temperature or amount of gas between the voltage application part and the ground part rises, it may cause insulation breakdown, so it is necessary to diffuse the heat of the gas. One countermeasure is a cooling method that promotes mixing of the high-temperature insulating gas with the surrounding low-temperature gas after blowing out the arc (see, for example, Patent Document 1).

Patent document 1 proposes a gas circuit breaker in which a guide plate installed as a stirring member between the end of a fixed arc contact and a fixed support arranged around the fixed arc contact changes the direction of the gas flow, promoting mixing with the surrounding low-temperature gas and cooling.

Japanese Patent Application Laid-Open No. 10-12104

However, in the gas circuit breaker of Patent Document 1, a stirring member is installed at the end of the fixed arcing contact located downstream of the insulating nozzle in the flow direction of the high-temperature insulating gas. When the moving arcing contact and the fixed arcing contact are separated by opening the current circuit, the stirring member moves further away from the arc region where the arc occurs due to the effect of the distance between them. In other words, after the arc is blown out, the high-temperature insulating gas leaves the insulating nozzle and travels a certain distance to the end of the fixed arcing contact, and then the flow direction is changed and stirred by the stirring member, resulting in a problem of insufficient mixing with the surrounding low-temperature gas.
The present disclosure has been made to solve the problems described above, and provides a gas circuit breaker which, compared to the gas circuit breaker of Patent Document 1, enhances the stirring effect that promotes mixing of high-temperature insulating gas with the surrounding low-temperature gas, by arranging a stirring member upstream, closer to the arc region, in the flow direction of the insulating gas after it is sprayed onto the arc, and thereby improves the efficiency of temperature averaging between the high-temperature gas and the surrounding low-temperature gas.

a gas blowing mechanism for blowing insulating gas onto an arc generated when the movable arc contact and the fixed arc contact are separated from each other; an insulating nozzle arranged so as to surround an arc region where an arc is generated; a cooling cylinder arranged downstream of the insulating nozzle in the flow direction of the insulating gas and for cooling the insulating gas blown onto the arc; and a stirring section including a stirring member attached to a tip portion which is an end portion of the insulating nozzle extending toward the cooling cylinder and for separating the flow of the insulating gas , the insulating nozzle being cylindrical in shape, and the stirring section including a support member arranged at the tip portion, a first stirring member arranged radially inward of the insulating nozzle from the support member and extending in the circumferential direction, and a second stirring member connecting the first stirring member and the support member, the first stirring member and the second stirring member being stirring members, and at least one of the first stirring member and the second stirring member has a cross section whose upstream end forms an acute angle toward the flow direction of the insulating gas.
The gas circuit breaker according to the present disclosure includes a sealed container filled with insulating gas, a fixed arc contact and a movable arc contact that are provided in the sealed container and arranged coaxially opposite each other so as to be able to come into contact with and separate from each other, a gas spraying mechanism that sprays insulating gas onto an arc that is generated when the movable arc contact and the fixed arc contact are separated, an insulating nozzle that is arranged so as to surround an arc region where an arc is generated, a cooling cylinder that is arranged downstream of the insulating nozzle in the flow direction of the insulating gas and that cools the insulating gas sprayed onto the arc, and a tip that is an end of the insulating nozzle that extends toward the cooling cylinder. and a stirring section including a stirring member attached to a tip of the insulating nozzle and separating the flow of the insulating gas, the insulating nozzle being cylindrical, and the stirring section having a support member arranged at the tip, a first stirring member arranged radially inward of the insulating nozzle from the support member and extending in a circumferential direction, and a second stirring member connecting the first stirring member and the support member, the first stirring member and the second stirring member being stirring members, the second stirring member extending in the radial direction from the first stirring member to the support member, and in a cross section perpendicular to the flow direction of the insulating gas, the circumferential width of the second stirring member is smaller than the radial width of the first stirring member.

In the gas circuit breaker according to the present disclosure, a stirring section having a stirring member is attached to the tip of an insulating nozzle surrounding the arc region. Compared to the conventional technology, the stirring member is positioned upstream closer to the arc region in the flow direction of the insulating gas after being sprayed onto the arc, thereby providing a gas circuit breaker that enhances the stirring effect that promotes mixing of the high-temperature insulating gas with the surrounding low-temperature gas and improves the efficiency of temperature averaging between the high-temperature gas and the surrounding low-temperature gas.

1 is a cross-sectional view showing a schematic configuration of a gas circuit breaker according to the present disclosure. 1 is a cross-sectional view showing a schematic configuration of an arc extinguishing device in a gas circuit breaker according to a first embodiment of the present disclosure. 2 is a cross-sectional view showing a stirring portion of an arc extinguishing device in the gas circuit breaker according to the first embodiment of the present disclosure. FIG. 4A to 4C are cross-sectional views showing a comparative example and a modified example of the stirring portion of the arc extinguishing device in the gas circuit breaker according to the first embodiment of the present disclosure. 11 is a cross-sectional view showing a stirring portion of an arc extinguishing device in a gas circuit breaker according to a second embodiment of the present disclosure. FIG. 11 is a cross-sectional view showing a stirring portion of an arc extinguishing device in a gas circuit breaker according to a third embodiment of the present disclosure. FIG. 13 is a cross-sectional view showing a stirring portion of an arc extinguishing device in a gas circuit breaker according to a fourth embodiment of the present disclosure. FIG. A cross-sectional view showing a stirring portion of an arc extinguishing device in a gas circuit breaker according to embodiment 5 of the present disclosure.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Note that in each of the following embodiments, similar components are designated by the same reference numerals.

Embodiment 1.
A gas circuit breaker according to embodiment 1 will be described below. Fig. 1 is a cross-sectional view showing a schematic configuration of a gas circuit breaker 100 according to the present disclosure.

As shown in Fig. 1, the gas circuit breaker 100 has a sealed container 1 and a drive mechanism unit 30 installed outside the sealed container 1. The sealed container 1 is provided with a first bushing 32 that houses a first bushing conductor 31, and a second bushing 34 that houses a second bushing conductor 33. The first bushing conductor 31 and the second bushing conductor 33 form part of a current circuit.

An insulating gas that insulates the sealed container 1 from the current circuit is sealed in the sealed container 1. Examples of the insulating gas include a single gas such as air, compressed air, sulfur hexafluoride (SF6), carbon dioxide (CO2), trifluoromethane iodide (CF3I), nitrogen (N2), oxygen (O2), tetrafluoromethane (CF4), argon (Ar), helium (He), etc., or a mixed gas of at least two of these gases.

Inside the sealed container 1, there are housed an arc extinguishing device 40 that extinguishes the arc that occurs when current is interrupted, a rod 41 that transmits driving force from the drive mechanism unit 30 to the movable part of the arc extinguishing device 40, and a movable side shield 42 that covers the outer periphery of the movable part of the arc extinguishing device 40.
The movable side shield 42 is electrically connected to the movable main contact 7 and the movable arc contact 6 described later via metal parts not shown, and is maintained at the same potential as the movable main contact 7 and the movable arc contact 6.

FIG. 2 is a cross-sectional view showing the configuration of an arc-extinguishing device 40 of a gas circuit breaker according to the present embodiment.
In FIG. 2, the movable shield 42 is omitted.
In Fig. 2 and the figures described later, the x-axis, y-axis, and z-axis are three axes perpendicular to each other. In the following description, the direction of the x-axis represents the central axis 101 of the arc-extinguishing device 40. The y-direction represents, for example, the vertical up-down direction. Fig. 2 shows an xy cross section of the arc-extinguishing device 40. In addition, the direction parallel to the central axis 101 (the left-right direction in Fig. 2) is referred to as the "axial direction", and the direction perpendicular to the axial direction is referred to as the "radial direction". The direction around the axial direction is referred to as the "circumferential direction".

As shown in FIG. 2, the arc extinguishing device 40 has a fixed main contactor 8, a fixed arc contactor 11, a movable main contactor 7, and a movable arc contactor 6. The fixed main contactor 8 and the fixed arc contactor 11 are fixed side contactors in the gas circuit breaker 100. The movable main contactor 7 and the movable arc contactor 6 are movable side contactors in the gas circuit breaker 100.

The fixed main contactor 8 and the fixed arc contactor 11 are both electrically connected to the second bushing conductor 33 shown in Figure 1. The fixed main contactor 8 has, for example, a cylindrical shape. The fixed arc contactor 11 has, for example, a rod shape. The fixed main contactor 8 and the fixed arc contactor 11 have their respective central axes arranged coaxially, which is the central axis 101 shown in Figure 2. The fixed main contactor 8 and the fixed arc contactor 11 are electrically connected to each other via metal parts not shown, and are maintained at the same potential.

The movable main contactor 7 and the movable arc contactor 6 are both electrically connected to the first bushing conductor 31 shown in Figure 1. The central axes of the movable main contactor 7 and the movable arc contactor 6 are arranged coaxially with the central axes 101 of the fixed main contactor 8 and the fixed arc contactor 11. The movable arc contactor 6 is connected to the drive mechanism 30 via the rod 41 shown in Figure 1. The movable main contactor 7 and the movable arc contactor 6 advance and retreat along the axial direction together with the puffer cylinder 3 and the insulating nozzle 9 described below by the driving force transmitted via the rod 41.

The movable main contactor 7 has, for example, an annular shape that can come into contact with the inner circumferential surface of the fixed main contactor 8. In the state shown in FIG. 2, the movable main contactor 7 is separated from the fixed main contactor 8 and is electrically isolated from the fixed main contactor 8. In other words, in the state shown in FIG. 2, the current circuit is open. When the movable main contactor 7 moves to the right in FIG. 2, the movable main contactor 7 comes into contact with the fixed main contactor 8 and is electrically connected to the fixed main contactor 8. This closes the current circuit and brings about a current-carrying state.

The fixed arc contact 11 and the movable arc contact 6 are electrically connectable to each other and are arranged coaxially opposite each other so as to be freely movable toward and away from each other. The movable arc contact 6 is brought into contact with and away from the fixed arc contact 11 by being driven in the axial direction.
The movable arc contact 6 has, for example, a cylindrical shape that can come into contact with the outer circumferential surface of the fixed arc contact 11. In the state shown in Fig. 2, the movable arc contact 6 is separated from the fixed arc contact 11 and is electrically separated from the fixed arc contact 11. When the movable arc contact 6 moves to the right in Fig. 2, the movable arc contact 6 comes into contact with the fixed arc contact 11 and is electrically connected to the fixed arc contact 11.

An arc occurs when the fixed arc contact 11 and the movable arc contact 6 are separated. The area in which an arc occurs between the fixed arc contact 11 and the movable arc contact 6 is the arc area 13 shown in Figure 2. The arc extinguishing device 40 has a gas blowing mechanism 5 that blows insulating gas onto the arc generated in the arc area 13. The gas blowing mechanism 5 has at least a puffer cylinder 3 and a puffer piston 50.

The puffer cylinder 3 is formed in a cylindrical shape with the rod 41 shown in FIG. 1 as its central axis. The puffer cylinder 3 is configured to move forward and backward along the axial direction together with the movable main contact 7 and the movable arc contact 6. The puffer piston 50 is inserted into the puffer cylinder 3. The puffer piston 50 is fixed to the sealed container 1 using an insulating support member. The puffer piston 50 moves forward and backward relative to the puffer cylinder 3 as the puffer cylinder 3 moves forward and backward. The space surrounded by the puffer cylinder 3 and the puffer piston 50 forms the puffer chamber 4. The puffer chamber 4 contains insulating gas sealed in the sealed container 1.

Furthermore, the arc extinguishing device 40 has a cooling cylinder 10 and an insulating nozzle 9. The cooling cylinder 10 is configured to cool the insulating gas that has been blown onto the arc and has become hot, and to return the cooled insulating gas to the space inside the sealed container 1. The cooling cylinder 10 is maintained at the same potential as the fixed main contact 8 and the fixed arc contact 11. The insulating nozzle 9 is configured to guide the insulating gas blown onto the arc to the cooling cylinder 10, and has a cylindrical shape extending in the axial direction. The insulating nozzle 9 is formed of an insulator. The insulating nozzle 9 is arranged to surround the outer periphery of the movable arc contact 6 and the fixed arc contact 11. As a result, the arc region 13 is located within the insulating nozzle 9, and the insulating nozzle 9 is arranged to surround the arc region 13.

In this embodiment, the central axes of the fixed main contact 8, fixed arc contact 11, movable main contact 7, movable arc contact 6, puffer cylinder 3, puffer piston 50, insulating nozzle 9 and cooling cylinder 10 are arranged coaxially, which is the central axis 101 shown in Figure 2.

2 , the flow direction of the insulating gas that has been blown by the arc and has become hot is indicated by an arrow in a flow direction 2. In the following, the terms "upstream" and "downstream" refer to the upstream and downstream in the flow direction 2 of the insulating gas.
In general, the fixed arcing contact 11 is rod-shaped and extends in the axial direction, and the insulating nozzle 9 is cylindrical and extends in the axial direction. In the vicinity of the fixed arcing contact outer peripheral surface 111, which is the outer peripheral surface of the fixed arcing contact 11, the flow direction 2 is parallel to the axial direction along the fixed arcing contact outer peripheral surface 111. In the insulating nozzle 9, for example, as shown in Fig. 2, the insulating nozzle inner peripheral surface 91, which is the inner peripheral surface of the insulating nozzle 9, is formed as a tapered surface so that the inner diameter becomes wider along the flow direction 2 of the insulating gas. In this case, the flow direction 2 of the insulating gas in the vicinity of the inner peripheral surface of the insulating nozzle 9 is inclined to the axial direction along the insulating nozzle inner peripheral surface 91, but the axial component is the main component.

The high-temperature insulating gas that leaves the arc region 13 in the insulating nozzle 9 flows into the cooling cylinder 10 located downstream of the insulating nozzle 9, and mixes with the original low-temperature gas in the cooling cylinder 10. An insulating gas flow path is formed from the insulating nozzle 9 to the cooling cylinder 10. The insulating nozzle 9 has a tip 92, which is the end that extends toward the cooling cylinder 10.

2, the stirring part 12 is attached to the tip 92 of the insulating nozzle 9. The stirring part 12 is disposed perpendicular to the axial direction.
Fig. 3 is a cross-sectional view showing the stirring portion 12 in the gas circuit breaker 100 according to the first embodiment. Fig. 3(a) is an enlarged view of an area E surrounded by a dashed line in Fig. 2. Fig. 3(a) shows an xy cross section of the stirring portion 12. Fig. 3(b) shows a yz cross section of the stirring portion 12 taken along line A-A in Fig. 3(a).

As shown in FIG. 3, in this embodiment, the stirring portion 12 is attached to the tip portion 92 perpendicular to the axial direction. The yz cross section of the stirring portion 12 perpendicular to the axial direction is a cross section perpendicular to the flow path of the insulating gas. The flow direction 2 of the insulating gas is the same direction as the axial direction, or the axial component is predominant, whereas the yz cross section of the stirring portion 12 is regarded as a cross section perpendicular to the flow direction 2. The stirring portion 12 includes a stirring member having a cross section perpendicular to the flow direction 2 of the insulating gas so as to separate the flow of the insulating gas.

As shown in Fig. 3(b), the yz cross section of the stirring unit 12 is a circle that expands in the radial direction. The stirring unit 12 has a first stirring member 20 on the inside in the radial direction, a support member 22 on the outside in the radial direction, and a second stirring member 21 that connects the first stirring member 20 and the support member 22.

As described above, the insulating nozzle 9 is cylindrical and extends in the axial direction, and the support member 22 is disposed at the tip 92. The first stirring member 20 is disposed radially inward of the insulating nozzle 9 from the support member 22. The support member 22 and the first stirring member 20 each extend in the circumferential direction and are formed in an annular shape. The second stirring member 21 is an arm that extends radially from the first stirring member 20 to the support member 22 so as to connect the first stirring member 20 and the support member 22.

The stirring section 12 has a stirring effect that promotes mixing of the high-temperature insulating gas and the surrounding low-temperature gas. The high-temperature, high-velocity insulating gas advances in the flow direction 2, collides with the first stirring member 20 and the second stirring member 21 of the stirring section 12, and is separated. The flow of the insulating gas is changed by the stirring section 12, generating a vortex. As the insulating gas flow advances downstream, the size of the vortex increases, and the insulating gas advances to the cooling cylinder 10 arranged downstream of the insulating nozzle 9 while being stirred by the vortex. In the cooling cylinder 10, the high-temperature insulating gas and the surrounding low-temperature gas continue to mix, so that the temperature of the high-temperature gas decreases. The first stirring member 20 and the second stirring member 21 are stirring members that separate the insulating gas flow, and function as a gas flow stirring means that promotes mixing of the high-temperature insulating gas and the surrounding low-temperature gas.

Compared to a structure in which a stirring member is installed downstream of the insulating nozzle in conventional technology, by installing the stirring part 12 at the tip 92 of the insulating nozzle 9, the stirring member does not move further away from the arc area due to the influence of the distance between the movable arc contact and the fixed arc contact, and the high-temperature insulating gas can be quickly separated after the arc is blown out, thereby improving the stirring effect that promotes gas mixing and efficiently averaging the gas temperature.

In general, the cross section perpendicular to the axial direction of the cylindrical insulating nozzle 9 extending in the axial direction is circular. The cross section perpendicular to the axial direction of the fixed arc contact 11 is also circular. In this case, the cross section perpendicular to the axial direction of the region in the insulating nozzle 9 where the flow rate of the insulating gas is fast is circular. In this embodiment, in order to efficiently separate the flow of insulating gas, it is preferable that the cross section perpendicular to the axial direction of the first stirring member 20 is circular. In addition, in accordance with the shape of the insulating nozzle 9, it is preferable that the cross section perpendicular to the axial direction of the support member 22 installed at the tip 92 is circular.

The first stirring member 20 and the support member 22 are intended to stir the gas flow and support the stirring member, respectively, and even if the cross-sectional shape is not circular, it is possible to realize each function. The shape of the cross section perpendicular to the axial direction of the first stirring member 20 may be, for example, a polygon such as a square, pentagon, hexagon, or octagon. The first stirring member 20 has a cross section perpendicular to the flow direction 2 of the insulating gas, and collides with the high-temperature, high-speed insulating gas flow, thereby separating the insulating gas flow and providing a stirring effect that promotes mixing of the high-temperature insulating gas with the surrounding low-temperature gas. In addition, the support member 22 may be formed intermittently in the circumferential direction so that it can be installed, for example, at the tip 92 of the insulating nozzle 9 to support the stirring member.

In addition, the support member 22 of the stirring unit 12 shown in Figure 3 is positioned on the outer periphery side of the insulating nozzle 9. Specifically, the support member 22 is attached so as to cover the outer periphery of the tip 92 of the insulating nozzle 9. The support member 22 has an inner diameter larger than the outer diameter of the tip 92, and includes a protrusion 221 that protrudes toward the insulating nozzle 9. This structure of the support member 22 increases the area covering the outer periphery of the insulating nozzle 9, improving the strength with which the stirring unit 12 is attached to the insulating nozzle 9 and simplifying assembly.

The support member 22 and the insulating nozzle 9 may be fastened with screws, but a plate or the like may be inserted between the support member 22 and the insulating nozzle 9 to mediate between the two.

In addition, the first stirring member 20, the second stirring member 21, and the support member 22 may be integrally molded by casting to reduce costs, or may be made as individual parts and assembled with screws or the like.

Figures 4 (a) and (b) show the xy cross-sectional structures of stirring sections 12a and 12b as comparative examples of the stirring section 12 shown in Figure 3.

4(a) is attached to the tip 92 of the insulating nozzle 9, and the support member 22a of the stirring part 12a is installed on the inner circumferential side of the insulating nozzle 9 and is covered by the tip 92. The support member 22a has an outer diameter smaller than the inner diameter of the tip 92 and includes a protruding part 222 that protrudes toward the insulating nozzle 9.
Since the stirring portion 12a of Comparative Example 1 is also attached to the tip portion 92, the stirring effect of the insulating gas can be improved.

On the other hand, compared to the stirring section 12a of Comparative Example 1, the stirring section 12 in which the support member 22 shown in Figure 3 is attached to the outer periphery of the insulating nozzle 9 has less effect on the space within the insulating nozzle 9, and therefore can reduce the pressure loss caused by providing resistance to the gas flow in the insulating gas flow path.

Figure 4 (b) also shows, as comparison example 2, an agitation section 12b having a second agitation member 21 fixed to the tip 92 of the insulating nozzle 9.

When attaching the stirring portion 12b of Comparative Example 2, for example, by processing a notch in the insulating nozzle 9 to accommodate the second stirring member 21, the second stirring member 21 can be installed in a state where it overlaps with the tip portion 92 of the insulating nozzle 9 and does not protrude outside the insulating nozzle 9 in the axial direction. In this case, the installation strength can be improved by fitting the stirring portion 12b with the insulating nozzle 9. Furthermore, in the stirring portion 12b, the support member 22 may have, for example, a protruding portion 221 that protrudes toward the insulating nozzle 9 so as to cover the outer periphery of the tip portion 92 of the insulating nozzle 9.
Since the stirring portion 12b of Comparative Example 2 is also attached to the tip portion 92, the effect of stirring the insulating gas can be improved.

On the other hand, in the case of Comparative Example 2, processing such as cutting is required so that the insulating nozzle 9 and the stirring portion 12b can be fitted together. Therefore, compared to the stirring portion 12b of Comparative Example 2, the stirring portion 12 shown in FIG. 3 can be installed more easily and has lower processing costs. Also, compared to the stirring portion 12b of Comparative Example 2, the stirring portion 12 shown in FIG. 3 is located outside the insulating nozzle 9 in the axial direction, so it has less impact on the space inside the insulating nozzle 9, and therefore it is possible to reduce the pressure loss caused by providing resistance to the gas flow in the insulating gas flow path.

FIG. 4( c ) shows a stirring unit 12 c having a support member 22 fixed to the tip 92 of the insulating nozzle 9 as a modified example of the stirring unit 12 shown in FIG.
When the stirring portion 12c is attached to the tip portion 92 of the insulating nozzle 9, the attachment strength between the insulating nozzle 9 and the stirring portion 12c can be increased, for example, by flattening the axial surface of the tip portion 92 that contacts the support member 22. The stirring portion 12c of the modified example can also increase the stirring effect of the insulating gas, similar to the stirring portion 12 shown in FIG.

According to the gas circuit breaker of embodiment 1, a stirring section having a stirring member is disposed at the tip of an insulating nozzle arranged to surround the arc region where an arc occurs. In the flow direction of the insulating gas after being sprayed onto the arc, the stirring member is disposed upstream closer to the arc region than in the conventional technology, thereby providing a gas circuit breaker that enhances the stirring effect that promotes mixing of the high-temperature insulating gas with the surrounding low-temperature gas and improves the efficiency of temperature averaging between the high-temperature gas and the surrounding low-temperature gas.

Embodiment 2.
In the second embodiment, the same components as those in the first embodiment of the present disclosure are designated by the same reference numerals, and descriptions of the same or corresponding parts are omitted. Hereinafter, the stirring portion in the gas circuit breaker according to the second embodiment will be described with reference to the drawings.

Figure 5 is a cross-sectional view showing the stirring portion 12 in a gas circuit breaker according to embodiment 2. Figure 5(a) shows the xy cross-sectional structure of the stirring portion 12. Figure 5(b) shows the yz cross-section of the stirring portion 12 taken along line A-A in Figure 5(a).

The fixed arc contact outer peripheral surface 111 and the insulating nozzle inner peripheral surface 91 face each other in the radial direction. In Figure 5, the center line 60 represents the extension line of the radial center position between the fixed arc contact outer peripheral surface 111 and the insulating nozzle inner peripheral surface 91 in the flow direction 2. In the radial direction, the distance from the center line 60 to the insulating nozzle inner peripheral surface 91 is the same as the distance from the center line 60 to the fixed arc contact outer peripheral surface 111.

As in the first embodiment, the stirring section 12 in the second embodiment is also disposed at the tip 92 of the insulating nozzle 9. Compared to the first embodiment, in the stirring section 12 in the second embodiment, the first stirring member 20 is located on the center line 60. At least a portion of the first stirring member 20 is disposed on the center line 60.

The flow velocity distribution of the high-temperature, high-velocity insulating gas varies depending on the location of the arc region 13 and the shape of the insulating nozzle 9, but generally, the flow velocity of the insulating gas is fastest near the radial center position between the fixed arc contact outer surface 111 and the insulating nozzle inner surface 91. By arranging the first stirring member 20 on an extension line in the flow direction 2 of the center position, which is the region where the insulating gas flows at a fast rate, the flow of the insulating gas can be separated more efficiently, forming a vortex and promoting the stirring effect.

According to the gas circuit breaker of embodiment 2, the mixing effect that promotes mixing of the high-temperature insulating gas with the surrounding low-temperature gas can be further improved compared to embodiment 1.

Embodiment 3
In the third embodiment, the same components as those in the first embodiment of the present disclosure are designated by the same reference numerals, and descriptions of the same or corresponding parts are omitted. Hereinafter, a stirring section in a gas circuit breaker according to the third embodiment will be described with reference to the drawings.

Figure 6 is a cross-sectional view showing the stirring portion 12 in a gas circuit breaker according to embodiment 3. Figure 6(a) shows the xy cross-sectional structure of the stirring portion 12. Figure 6(b) shows a yz cross-section of the stirring portion 12 taken along line A-A in Figure 6(a). Figures 6(c) and (d) show xz cross-sections of the second stirring member 21 taken along line B-B in Figure 6(b).

In the gas circuit breaker of embodiment 3, in the flow direction 2 of the insulating gas, at least one of the first stirring member 20 and the second stirring member 21 of the stirring section 12 has a cross-section in which the upstream end forms an acute angle toward the flow direction 2.

6(a), in a cross section parallel to the axial direction, the first agitating member upstream end 201, which is the upstream end, forms an acute angle toward the flow direction 2. In other words, the upstream end of the first agitating member 20 is formed so that its radial width decreases toward the flow direction 2. Since the first agitating member 20 has an annular shape in a cross section perpendicular to the axial direction, the first agitating member upstream end 201 extending in the circumferential direction forms an acute angle toward the flow direction 2.
The acute angle of the upstream end 201 of the first agitating member 20 makes it possible to reduce pressure loss caused by providing resistance to the gas flow at low cost.

As shown in Fig. 6(b), the second agitating member 21 extends in the radial direction so as to connect the annular first agitating member 20 and the support member 22. In this case, as shown in Fig. 6(c), in a cross section parallel to the axial direction, the second agitating member upstream end 211, which is the upstream end of the second agitating member 21, forms an acute angle toward the flow direction 2. In other words, the upstream end of the second agitating member 21 is formed so that its circumferential width decreases toward the flow direction 2.
The acute angle of the upstream end 211 of the second agitating member 21 makes it possible to reduce pressure loss caused by providing resistance to the gas flow at low cost.

Since the flow direction 2 of the insulating gas is the same as the axial direction or has an axial component as its main direction, a cross section parallel to the axial direction is regarded as a cross section parallel to the flow direction 2. At least one of the first stirring member 20 and the second stirring member 21 has a cross section parallel to the flow direction 2 in which the upstream end forms an acute angle toward the flow direction 2.

In addition, the second agitating member 21 shown in Fig. 6(c) may have a second agitating member downstream end 213 whose downstream end forms an acute angle with the flow direction 2, as in the second agitating member 21 shown in Fig. 6(d), in contrast to the second agitating member downstream end 212 which is the downstream end of the second agitating member 21 shown in Fig. 6(c). This makes it possible to reduce pressure loss caused by providing resistance to the gas flow.
Similarly, with respect to the first agitating member 20 , the downstream end portion facing the upstream end portion 201 of the first agitating member on the upstream side may form an acute angle along the flow direction 2 .

In the stirring section 12 attached to the tip 92 of the insulating nozzle 9, regardless of the acute angle shape of the downstream end of the stirring member, the flow of insulating gas is high speed, so that a vortex is generated by the stirring member, which promotes mixing of the high-temperature insulating gas with the surrounding low-temperature gas.

According to the gas circuit breaker of the third embodiment, as in the first embodiment, the stirring part attached to the tip of the insulating nozzle can improve the stirring effect that promotes mixing of the high-temperature insulating gas with the surrounding low-temperature gas. In addition, compared to the first embodiment, the pressure loss caused by providing resistance to the gas flow can be reduced at a lower cost.

Fourth embodiment
In the fourth embodiment, the same components as those in the first embodiment of the present disclosure are designated by the same reference numerals, and descriptions of the same or corresponding parts are omitted. Hereinafter, a stirring section in a gas circuit breaker according to the fourth embodiment will be described with reference to the drawings.

Figure 7 is a cross-sectional view showing the stirring portion 12 in a gas circuit breaker according to embodiment 4. Figure 7 shows the xy cross-sectional structure of the stirring portion 12. In the stirring portion 12 shown in Figure 7, the outer circumferential diameter at the upstream end of the first stirring member 20 is indicated as upstream outer circumferential diameter 24, and the outer circumferential diameter at the downstream end is indicated as downstream outer circumferential diameter 25. When the first stirring member 20 is, for example, cylindrical and extends in the flow direction 2, the upstream outer circumferential diameter 24 and the downstream outer circumferential diameter 25 are the diameters of the outer circumferential surfaces of the upstream end and downstream end, respectively.

In the stirring section 12 in the gas circuit breaker according to the fourth embodiment, the downstream outer circumferential diameter 25 of the first stirring member 20 is larger than the upstream outer circumferential diameter 24 in the flow direction 2 of the insulating gas. As a result, the flow direction 2 of the insulating gas spreads and advances to the outside of the insulating nozzle 9 in the flow direction 2a, as shown in FIG.
Compared to the first embodiment, the stirring portion 12 in the third embodiment can further improve the stirring effect for promoting the mixing of the high-temperature insulating gas and the surrounding low-temperature gas.

Fifth embodiment
In the fifth embodiment, the same components as those in the first embodiment of the present disclosure are designated by the same reference numerals, and descriptions of the same or corresponding parts are omitted. Hereinafter, the stirring portion in the gas circuit breaker according to the fifth embodiment will be described with reference to the drawings.

Figures 8(a) and (b) are cross-sectional views showing the stirring sections 12 and 12d, respectively, in a gas circuit breaker according to embodiment 5. Figures 8(a) and (b) show the yz cross-sectional structures of the stirring sections 12 and 12d. The yz cross-section of the stirring section is regarded as a cross-section perpendicular to the flow direction 2 of the insulating gas, and Figures 8(a) and (b) are also cross-sectional views perpendicular to the flow direction 2 of the stirring sections 12 and 12d.

In the stirring section 12 of the gas circuit breaker of embodiment 5, in a cross section perpendicular to the flow direction 2, the circumferential width of the second stirring member 21 is smaller than the radial width of the first stirring member 20.

In the stirring section 12 shown in FIG. 8(a), the first stirring member 20 is annular and extends in the circumferential direction, and the second stirring member 21 extends in the radial direction from the first stirring member 20 to the support member 22, centered on the axial direction. This structure provides a higher stirring effect for the insulating gas of the first stirring member 20 compared to the second stirring member 21. The second stirring member 21 is a connecting part that connects the first stirring member 20 and the support member 22, and is preferably as thin as possible as its strength allows. As shown in FIG. 8(a), the second stirring member width 26, which is the circumferential width of the second stirring member 21, is smaller than the first stirring member width 27, which is the radial width of the first stirring member 20. This reduces the pressure loss caused by providing resistance to the gas flow.

In addition, in the stirring section 12d shown in Fig. 8(b), the second stirring member width 26 of the second stirring member 21 is smaller than the first stirring member width 27 of the first stirring member 20, and further, the number of second stirring members 21 in the stirring section 12d shown in Fig. 8(b) is smaller than that in the stirring section 12 shown in Fig. 8(a). It is preferable to reduce the number of second stirring members 21 as connecting parts as far as their strength allows, in order to reduce pressure loss when gas flows.

It is also possible to reduce the pressure loss caused by resistance to the gas flow, for example, by reducing the proportion of the total cross-sectional area of the second stirring member 21 compared to the proportion of the cross-sectional area of the first stirring member 20 in a cross section perpendicular to the flow direction 2.

According to the gas circuit breaker of embodiment 5, similar to embodiment 1, the stirring part attached to the tip of the insulating nozzle can improve the stirring effect that promotes mixing of the high-temperature insulating gas with the surrounding low-temperature gas. Also, compared to embodiment 1, in embodiment 5, the width, number, or cross-sectional area of the second stirring member can be reduced to reduce the pressure loss caused by providing resistance to the gas flow.

Note that the configurations shown in the above embodiments are merely examples of the contents of the present disclosure, and may be combined with other known technologies, and parts of the configurations may be omitted or modified without departing from the gist of the present disclosure.

1 sealed container, 2 flow direction, 3 puffer cylinder, 4 puffer chamber, 5 gas blowing mechanism, 6 movable arc contact, 7 movable main contact, 8 fixed main contact, 9 insulating nozzle, 91 insulating nozzle inner surface, 92 tip, 10 cooling cylinder, 11 fixed arc contact, 111 fixed arc contact outer surface, 12, 12a, 12b, 12c, 12d stirring section, 13 arc region, 20 first stirring member, 21 second stirring member, 22 support member, 201, first stirring member upstream end, 211 second stirring member upstream end, 212, 213 second stirring member downstream end, 24 upstream outer diameter, 25 downstream outer diameter, 26 second stirring member width, 27 first stirring member width, 30 drive mechanism, 31 first bushing conductor, 32 first bushing, 33 second bushing conductor, 34 Second bushing, 40 arc extinguishing device, 41 rod, 42 movable shield, 50 puffer piston, 100 gas circuit breaker

Claims (6)

A sealed container filled with an insulating gas;
A fixed arc contact and a movable arc contact are provided in the sealed container and are arranged coaxially opposite to each other so as to be freely contactable and detachable;
a gas blowing mechanism that blows the insulating gas against an arc that is generated when the movable arc contact and the fixed arc contact are separated from each other;
an insulating nozzle disposed to surround an arc region where the arc occurs;
a cooling cylinder disposed downstream of the insulating nozzle in a flow direction of the insulating gas, the cooling cylinder cooling the insulating gas sprayed onto the arc;
a stirring unit that is attached to a tip portion that is an end portion of the insulating nozzle extending toward the cooling cylinder and includes a stirring member that separates the flow of the insulating gas;
Equipped with
The insulating nozzle is cylindrical,
The stirring unit includes:
A support member disposed at the tip portion;
a first stirring member disposed radially inward of the insulating nozzle relative to the support member and extending in a circumferential direction;
a second agitating member connecting the first agitating member and the support member;
the first agitating member and the second agitating member are the agitating members,
At least one of the first stirring member and the second stirring member has a cross section whose upstream end forms an acute angle toward the flow direction of the insulating gas . A sealed container filled with insulating gas;
A fixed arc contact and a movable arc contact are provided in the sealed container and are arranged coaxially opposite to each other so as to be freely contactable and detachable;
a gas blowing mechanism that blows the insulating gas against an arc that is generated when the movable arc contact and the fixed arc contact are separated from each other;
an insulating nozzle disposed to surround an arc region where the arc occurs;
a cooling cylinder disposed downstream of the insulating nozzle in a flow direction of the insulating gas, the cooling cylinder cooling the insulating gas sprayed onto the arc;
a stirring unit that is attached to a tip portion that is an end portion of the insulating nozzle extending toward the cooling cylinder and includes a stirring member that separates the flow of the insulating gas;
Equipped with
The insulating nozzle is cylindrical,
The stirring unit includes:
A support member disposed at the tip portion;
a first stirring member disposed radially inward of the insulating nozzle relative to the support member and extending in a circumferential direction;
a second stirring member connecting the first stirring member and the support member;
the first agitating member and the second agitating member are the agitating members,
the second agitating member extends radially from the first agitating member to the support member;
a circumferential width of the second stirring member being smaller than a radial width of the first stirring member in a cross section perpendicular to a flow direction of the insulating gas ; 3. The gas circuit breaker according to claim 1, wherein the support member is disposed on an outer circumferential side of the insulating nozzle. The first stirring member is
3. The gas circuit breaker according to claim 1 , wherein the insulating nozzle is located on an extension line of a radial center position between an outer circumferential surface of the fixed arc contact and an inner circumferential surface of the insulating nozzle in a flow direction of the insulating gas. 3. The gas circuit breaker according to claim 2, wherein at least one of the first stirring member and the second stirring member has a cross section in which an upstream end forms an acute angle toward the flow direction of the insulating gas. 3. The gas circuit breaker according to claim 1 , wherein the first agitating member has an outer circumferential diameter on a downstream side in a flow direction of the insulating gas that is larger than an outer circumferential diameter on an upstream side.

Images